Apparatus and Method to Perform Secure Data Sharing in a Distributed Network by Using a Blockchain

1. A non-transitory computer-readable storage medium storing a program that causes a processor included in an apparatus to execute a process, the process comprising: sharing information, regarding data owned by a terminal, in a distributed file sharing network including a plurality of apparatuses in which the apparatus is included; acquiring an address information based on information which is acquired from a blockchain network different from the distributed file sharing network, the address information indicating specific data among the data which have been shared in the distributed file sharing network; issuing a transaction in the blockchain network as a file data-reading transaction, the file data-reading transaction including the address information used for accessing the specified data by the apparatus; receiving the specified data, from the distributed file sharing network, based on the shared information and the address information by the issuing of the transaction in the blockchain network as the file data-reading transaction; issuing another file data-reading transaction including another address information of a portal file; and obtaining the portal file by specifying the another address information included in the another file data-reading transaction, wherein the specified data is included in the portal file, the address information indicates the specified data included in the portal file, and the address information is acquired after acquiring the portal file.

2. The non-transitory computer-readable storage medium according to claim 1 , wherein the information regarding data is shared in the distributed file sharing network by using an approval result in the blockchain network.

3. The non-transitory computer-readable storage medium according to claim 1 , wherein the information regarding data includes the address information indicating the specified data, and the address information associated with service information corresponding to the specified data is shared as the information regarding data in the distributed file sharing network.

4. The non-transitory computer-readable storage medium according to claim 3 , wherein the process further comprises: managing, by the blockchain network, a data history of the specified data during sharing the address information of the specified data in the distributed file sharing network.

5. The non-transitory computer-readable storage medium according to claim 3 , wherein the process further comprising: managing, by the blockchain network, an access history indicating the apparatus access to the distributed file sharing network.

6. A node apparatus comprising: a memory; and circuitry coupled to the memory and configured to: share information, regarding data owned by a terminal, in a distributed file sharing network including a plurality of node apparatuses in which the node apparatus is included; acquire an address information based on information which is acquired from a blockchain network different from the distributed file sharing network, the address information indicating specific data among the data which have been shared in the distributed file sharing network; issue a transaction in the blockchain network as a file data-reading transaction, the file data-reading transaction including the address information used for accessing the specified data by the node apparatus; receive the specified data, from the distributed file sharing network, based on the shared information and the address information by the issuing of the transaction in the blockchain network as the file data-reading transaction; issue another file data-reading transaction including another address information of a portal file; and obtain the portal file by specifying the another address information included in the another file data-reading transaction, wherein the specified data is included in the portal file, the address information indicates the specified data included in the portal file, and the address information is acquired after acquiring the portal file.

7. A communication method comprising: sharing information, regarding data owned by a terminal, in a distributed file sharing network including a plurality of apparatuses; acquiring an address information based on information which is acquired from a blockchain network different from the distributed file sharing network, the address information indicating specific data among the data which have been shared in the distributed file sharing network; issuing a transaction in the blockchain network as a file data-reading transaction, the file data-reading transaction including the address information used for accessing the specified data by an apparatus; receiving the specified data, from the distributed file sharing network, based on the shared information and the address information by the issuing of the transaction in the blockchain network as the file data-reading transaction; issuing another file data-reading transaction including another address information of a portal file; obtaining the portal file by specifying the another address information included in the another file data-reading transaction; and wherein the specified data is included in the portal file, the address information indicates the specified data included in the portal file, and the address information is acquired after acquiring the portal file.